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I don't think the above letters are "fake" or "scams", they're just using scare tactics that take advantage of new business owners who don't know the laws. What they are stating in the letters is likely accurate information, but they're charging a ridiculous fee for something you can create yourself or buy for much less.

However, for most small businesses with 0-x employees, these signs are not even required by the State.

That makes me wonder wouldn't these people have better success if they just sent letters with genuine offers with reasonable prices with these products that may help new small business?

That market is likely already full of successful legit businesses charging a reasonable fee and that's why these biz exist ... to get the outliers and make a huge profit making up for the minimum action.